882
FXUS66 KSGX 070507
AFDSGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
907 PM PST SAT DEC 6 2025
SYNOPSIS
PATCHY LOW CLOUDS AND FOG POSSIBLE IN THE COASTAL AREAS TONIGHT
AND SUNDAY NIGHT. INCREASINGLY WARM AND DRY CONDITIONS ARE IN
STORE FOR NEXT WEEK WITH PERIODS OF WEAK TO LOCALLY MODERATE SANTA
ANA WINDS. TUESDAY WILL LIKELY BE THE WARMEST DAY WITH
TEMPERATURES 15 TO 20 DEGREES ABOVE SEASONAL AVERAGES IN THE
INLAND VALLEYS.
DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
TODAY WAS ANOTHER RELATIVELY WARM DAY WITH THE SEA BREEZE MAKING A
RETURN AND PUSHING MORE MOIST AIR A FEW MILES INLAND. DEW POINT
TEMPERATURES ARE GENERALLY A FEW DEGREES HIGHER THAN AT THIS TIME
YESTERDAY AND SKIES ARE CLEAR, ALTHOUGH PATCHES OF LOW CLOUDS AND
FOG ARE DEVELOPING OVER THE COASTAL WATERS. THE HIGH-RESOLUTION
MODELS ARE INDICATING A 15-25 PERCENT CHANCE FOR PATCHY DENSE FOG
IN THE COASTAL AREAS...MAINLY BETWEEN MIDNIGHT AND ABOUT 2 AM.
FROM THE PREVIOUS DISCUSSION...
OVER THE NEXT FEW DAYS, THE BROAD UPPER HIGH PRESSURE AREA CURRENTLY
A FEW HUNDRED MILES WEST OF SAN DIEGO WILL SLOWLY EXPAND EAST TO
COVER CALIFORNIA, THEN AMPLIFY NORTHWARD, CUTTING OFF WHAT IS LEFT
OF THE ONSHORE FLOW AND WARMING TEMPERATURES UP TO 10-20 DEGREES
ABOVE AVERAGE BY TUESDAY. HIGHS LIKELY ABOVE 80F JUST A FEW MILES
INLAND OF THE COAST. FROM TUESDAY THROUGH FRIDAY, CONFIDENCE IS HIGH
THAT THE RIDGE WILL KEEP ITS GENERAL POSITIONING OVER THE WESTERN
US. FOR EACH OF THESE FOUR DAYS, AROUND A 30% CHANCE FOR HIGH
TEMPERATURES TO EXCEED 85F IN THE INLAND VALLEYS. NEXT SATURDAY AND
ONWARD, MOST MODEL GUIDANCE SHOW EITHER WEAKENING OF THE RIDGE, OR
PROGRESSION OF THE RIDGE INTO THE INTERIOR US CAUSING TEMPERATURES
TO COOL DOWN SLIGHTLY BUT WITHOUT A SIGNIFICANT PATTERN CHANGE UNTIL
AT LEAST THE FOLLOWING WEEK.
MEANWHILE, A SURFACE HIGH PRESSURE WILL DEVELOP OVER COLORADO ON
SUNDAY BEHIND THE BROADER TROUGH THROUGHOUT THE EASTERN US, DRIVING
A MODEST 10-15 MB PRESSURE GRADIENT BETWEEN SOUTHERN CALIFORNIA AND
THE INTERIOR US. OFFSHORE (E/NE) SANTA ANA WINDS PICK UP SUNDAY
AFTERNOON THROUGH THE PASSES, THEN EXPAND TO COASTAL SLOPES MONDAY,
REMAINING ELEVATED THROUGH AT LEAST THURSDAY AS LONG AS THE SURFACE
GRADIENT PERSISTS. DURING THIS PERIOD, WIND GUSTS OF 30-45 MPH,
LOCALLY UP TO 50 MPH ARE POSSIBLE EACH DAY FOR THE PASSES AND
COASTAL SLOPES. THE INTENSITY OF THE WINDS WILL VARY SLIGHTLY DAY TO
DAY AND WILL BE GENERALLY STRONGEST IN THE MORNINGS. DAYTIME
HUMIDITIES INLAND WILL DROP INTO THE 10-20% RANGE DURING THE
AFTERNOONS, ONLY RECOVERING INTO THE 30-40% RANGE AT NIGHT. IN THE
CASE THAT THE RIDGE WEAKENS OR MOVES EAST BY THE END OF THE WEEK,
ONSHORE WINDS MAY PREVAIL AGAIN SATURDAY ONWARD.
AVIATION
07430Z....LOW CLOUDS/FOG HAVE THE POTENTIAL TO DEVELOP ALONG THE
IMMEDIATE COAST LATER TONIGHT. CHANCES ARE 10-20% IN SAN DIEGO
COUNTY THROUGH 12Z SUN AND 20-30% IN ORANGE COUNTY THROUGH 14Z.
AREAL COVERAGE OF ANY LOW CLOUDS/FOG WILL BE PATCHY WITH BASES
LESS THAN 500 FT AND VISIBILITY 1 MILE OR LESS. CONFIDENCE IS NOT
HIGH ENOUGH IN VIS RESTRICTIONS TO INCLUDE FOG IN THE TAFS AT
COASTAL SITES AT THIS TIME. VFR CONDITIONS WILL PREVAIL FOR INLAND
AREAS THROUGH THE TAF PERIOD.
MARINE
THERE IS A 10-20% CHANCE OF DENSE FOG WITH VISIBILITY 1 NAUTICAL MILE
OR LESS DEVELOPING OVERNIGHT TONIGHT INTO SUNDAY MORNING.
BEACHES
MORNING HIGH TIDE IS PREDICTED TO BE 6.5 TO 7 FT ON SUNDAY AT 10 AM
IN LA JOLLA AND AT 9:50 AM IN NEWPORT BEACH. VERY HIGH TIDES MAY
RESULT IN TIDAL OVERFLOW IN NORMALLY DRY BEACH AREAS. HIGH TIDE IS
PREDICTED TO FALL BELOW 6 FT BY MONDAY.
SKYWARN
SKYWARN ACTIVATION IS NOT REQUESTED. HOWEVER WEATHER SPOTTERS ARE
ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS.
SGX WATCHES/WARNINGS/ADVISORIES
CA...NONE.
PZ...NONE.
PUBLIC...PG
AVIATION/MARINE/BEACHES...APR
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